Thanks @Jeff-UK
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Gateway and Node were about 10m apart but have further separated them and no difference.
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Double checked the Gateway and Node channel settings and they are the same. (the RX2 is 923.3Mhz in Aus)
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Reduced the frequency of update out to 600sec.
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Tried changing to ABP - the node says it has a successful join but no data shows up in TTN
Appreciate any other things to try!
Cheers.